Chill Touch is not working properly. The "Chilled" status currently ends at the start of a chilled creatures turn, not at the start of the Casters turn. RAW, in 5e, the anti-healing debuff should last until the start of the turn of the Caster of the spell, not its target. This makes the anti-healing property nearly useless, and completely useless against Sorak's regeneration and ability "Call of the Night".
Edit: This appears to maybe be a 'sometimes' bug. When my cleric went immediately before the Sorak, the Chilled status remained and the regeneration was denied. However, multiple other turns for the Sorak's have started with the "Chilled" message and the status ending, allowing them to heal. Will update here if I notice any other trends.